DevTools: Process correctly a disconnection during target initialization

Source/devtools/front_end/main/Main.js

 /*
  * Copyright (C) 2006, 2007, 2008 Apple Inc.  All rights reserved.
  * Copyright (C) 2007 Matt Lilek (pewtermoose@gmail.com).
  * Copyright (C) 2009 Joseph Pecoraro
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
@@ skipping 300 matching lines @@
         WebInspector.breakpointManager = new WebInspector.BreakpointManager(WebInspector.settings.breakpoints, WebInspector.workspace, WebInspector.targetManager, WebInspector.debuggerWorkspaceBinding);
         WebInspector.scriptSnippetModel = new WebInspector.ScriptSnippetModel(WebInspector.workspace);
         this._executionContextSelector = new WebInspector.ExecutionContextSelector();
 
         if (!WebInspector.isWorkerFrontend())
             WebInspector.inspectElementModeController = new WebInspector.InspectElementModeController();
         this._createGlobalStatusBarItems();
     },
 
     /**
-     * @param {!WebInspector.Target} mainTarget
+     * @param {?WebInspector.Target} target
      */
-    _mainTargetCreated: function(mainTarget)
+    _mainTargetCreated: function(target)
     {
         console.timeStamp("Main._mainTargetCreated");
 
+        var mainTarget = /** @type {!WebInspector.Target} */(target);
         this._registerShortcuts();
 
         WebInspector.workerTargetManager = new WebInspector.WorkerTargetManager(mainTarget, WebInspector.targetManager);
 
         InspectorBackend.registerInspectorDispatcher(this);
 
         if (WebInspector.isWorkerFrontend())
             mainTarget.workerManager.addEventListener(WebInspector.WorkerManager.Events.WorkerDisconnected, onWorkerDisconnected);
 
         function onWorkerDisconnected()
@@ skipping 563 matching lines @@
 
 WebInspector.Main.InspectedNodeRevealer.prototype = {
     /**
      * @param {!WebInspector.Event} event
      */
     _inspectNode: function(event)
     {
         WebInspector.Revealer.reveal(/** @type {!WebInspector.DOMNode} */ (event.data));
     }
 }